Image Display Device Capable of Expressing Multiple Depth

1. An image display apparatus comprising: a display device configured to modulate light to form an image; a driver configured to drive the display device such that a position of the display device varies; a light transmitter configured to transmit the image formed by the display device to an observer's eye and comprising a focusing member; and a processor configured to; generate driving signal based on image information, wherein the image information comprises depth information related to the position of a virtual image plane with respect to each of a plurality of images, generate a scale factor to be applied to any one of two successive images with different depth information from among the plurality of images, generate a light modulation signal based on the image information and the scale factor, and control the display device and the driver according to the light modulation signal and the driving signal, respectively.

2. The image display apparatus of claim 1, wherein the driver is further configured to move the display device in parallel such that a distance between the display device and the focusing member varies.

3. The image display apparatus of claim 1, wherein the driver comprises a shape variable portion which is deformable according to an applied signal to provide a driving force to the display device.

4. The image display apparatus of claim 3, wherein the shape variable portion comprises a material of which a shape varies by heat.

5. The image display apparatus of claim 3, wherein the shape variable portion comprises a shape memory alloy or an electro active polymer.

6. The image display apparatus of claim 1, wherein the light transmitter is further configured to transmit the image formed by the display device to the observer's eye as an enlarged image on the virtual image plane at a predetermined position.

7. The image display apparatus of claim 1, wherein the depth information comprises information previously set from a saliency map with respect to each of the images of the plurality of frames.

8. The image display apparatus of claim 1, wherein the processor is further configured to: compute a magnification at which each of the two successive images is imaged, and based on a change value between the magnifications at which each of the two successive images is imaged being equal to or less than a predetermined reference value, set the scale factor to 1.

9. The image display apparatus of claim 1, wherein the processor is further configured to: compute a magnification at which each of the two successive images is imaged, and based on the change value between the magnifications at which each of the two successive images is imaged being larger than a predetermined reference value, determine a similarity of the two successive images.

10. The image display apparatus of claim 9, wherein the processor is further configured to: based on the similarity of the two successive images being equal to or less than a the predetermined reference value, set the scale value to 1, and based on the similarity of the two successive images being larger than the predetermined reference value, generate a scale factor that offsets the change value.

11. The image display apparatus of claim 1, wherein the processor is further configured to transmit the driving signal based on a predetermined time delay compared to transmission of the light modulation signal.

12. The image display apparatus of claim 11, wherein the predetermined time delay is equal to or greater than a convergence-accommodation time of the observer's eye.

13. The image display apparatus of claim 1, wherein the light transmitter is further configured to combine first light comprising an image from the display device with second light comprising an image of a real environment in front of an observer and to transmit the combined light to the observer's eye.

14. The image display apparatus of claim 13, wherein the light transmitter further comprises: a beam splitter disposed obliquely with respect to a traveling path of the first light and a traveling path of the second light.

15. The image display apparatus of claim 14, wherein the beam splitter comprises a half mirror.

16. The image display apparatus of claim 1, wherein the display device comprises a first display device and a second display device, wherein the driver comprises a first driver and a second driver respectively configured to drive the first display device and the second display device such that positions of the first display device and the second display device vary, and wherein the light transmitter comprises a first light transmitter and a second light transmitter configured to transmit images formed by the first display device and the second display device to a left eye and a right eye of the observer, respectively.

17. The image display apparatus of claim 16, wherein the image information comprises information about a pair of a left eye image and a right eye image to be perceived as a three-dimensional (3D) image, and wherein the processor is further configured to control the first display device and the second display device such that the left eye image is formed by the first display device and the right eye image is formed by the second display device.

18. The image display apparatus of claim 17, wherein the image information further comprises: depth information related to positions of a virtual image plane on which the left eye image and the right eye image are to be imaged, and wherein the processor is further configured to control the first driver and the second driver according to the depth information.

19. The image display apparatus of claim 16, wherein the image display apparatus is a wearable apparatus.

20. An image display apparatus comprising: a display device configured to modulate light to form an image; a driver configured to drive the display device such that a position of the display device varies; a light transmitter configured to transmit the image formed by the display device to an observer's eye and comprising a focusing member; a processor configured to generate a light modulation signal and a driving signal according to image information and to control the display device and the driver according to the light modulation signal and the driving signal, respectively; and an eye tracking sensor configured to sense a depth position that the observer's eye views, wherein the processor is further configured to: generate the driving signal based on a depth value set by using a saliency map with respect to each image of a plurality of frames, and based on the depth value set by using the saliency map and a measurement value sensed by the eye tracking sensor belonging to different ranges among a previously set near range and a previously set far range, correct the driving signal.

21. The image display apparatus of claim 20, wherein the processor is further configured to generate the driving signal based on the measurement value sensed by the eye tracking sensor.

22. The image display apparatus of claim 20, wherein the processor is configured to determine whether the measurement value is within a near range or a far range, and generate the driving signal so that the display device is driven to a position corresponding to one of two representative values representing the near range and the far range.

23. The image display apparatus of claim 20, wherein the processor is configured to correct the driving signal based on the measurement value sensed by the eye tracking sensor.